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20121129
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and electron or light or something hits, makes electron go up, come back down, boom, off goes the energy in the form of light. the same thing happens when you excite the innermost electrons. if you excite those-- it takes a lot more energy-- and you're knocking electron way up and it comes way back down, boom, that light photon that emerges is beyond the range of seeing. it's even beyond the ultraviolet, and that's what x-rays turned out to be. simply high frequency light from the orbital electrons jumping orbits that correspond to great energies. but after that, it was found that there were radiations coming from different minerals that did not have to do with the electron orbiting around nucleus. it had to do with the nucleus itself. and the radiations that were emitted, to make a long story short, were three different types. now you might think they'd call them maybe "a," b, c, right? but these are physicists, gang. we didn't call them "a," b, c. you know what we called them? alpha, beta, gamma. that's "a," b, c in greek, yeah? so alpha, beta, gamma ray. and it turns out that those ra
century, e=mc2, which tells us that that which we call energy and that which we call mass, two sides of the same coin. if you go to stanford, california, you'll see the stanford linear accelerator. you're driving down the freeway 280, there's a great big long concrete tube, two miles long. and that concrete two-mile-long tube, they fire electrons. and these electrons go right down a vacuum pipe. gotta get all the air away, they don't want to get these electrons to get obstructed. and they'll fire for two miles down that tube. and when they get to the end, boom, they smatter into particles of matter and they smash it all apart and they take a look to see what it's made of. for example if i wanna know what this watch is made of, the one way to find out what this watch is made of is to take the watch, find a concrete wall, take that watch and throw it as fast as i can. and when it splatters, take some pictures, quick. and that way i can find out what's inside. does that make sense? well, that's what the phys-ers do. they do that with atoms and they smash them apart and they see all the
to acquire. her themes were fragile; yet her energy and force are felt in the brilliant play of her colors and the dynamic precision of her design. mary cassatt was a master. her vibrant works resound with life. ( banjo music ) sasman: those who wish for a leness at a reasonable price areinvit. persons wishin' a flat picture can have a likeness without shade or shadow at 1/4 price. narrator: william prior was but one of many self-appointed painters to the new republic. some, like him, were prosperous and skilled-- painters by profession, following the ancient tradition of the limner. others were just men and women who could turn a capable hand to many different tasks: village artisans who were also farmers, housewives, schoolteachers, carpenters, jacks-of-all-trade; or itinerants-- travelers infected with the restless exuberant spirit of early america. they would paint for lodging and a meal. many remain unknown. all were academically untrained but their eyes were sharp. james bard spent a lifetime painting steamboats in new york. shipbuilders admired his accuracy, claiming they could lay
Search Results 0 to 2 of about 3